CN2729437Y

CN2729437Y - Oil seal (I)

Info

Publication number: CN2729437Y
Application number: CNU200420096215XU
Authority: CN
Inventors: 陈正雄
Original assignee: SHANGHAI MAIHUA OIL SEALING INDUSTRY Co Ltd
Current assignee: SHANGHAI MAIHUA OIL SEALING INDUSTRY Co Ltd
Priority date: 2004-09-29
Filing date: 2004-09-29
Publication date: 2005-09-28
Anticipated expiration: 2014-09-29

Abstract

The utility model provides an oil sealing, comprising a main body and a friction casing. The main body is sheathed with the friction casing and the friction casing comprises a side wall part and a circumference part. The side wall part is provided with a periphery end face and one end of the circumference part, corresponding to the oil face side, is provided with a stop ring. The body comprises a metal ring, a spring and a rubber ring. The rubber ring is provided with a groove and the opening of the groove faces the oil face, and the groove successively comprises three ring surfaces and the metal ring is sheathed on the ring surfaces. The ring surface is provided with spring slots and the spring is held in the spring slot. The side of the rubber ring, facing outwards the air, is eminently provided with a dirt lip. Before the oil seal is assembled, the dirt lip and the periphery end face of the friction casing have an interstice and after the oil seal is assembled, the dirt lip is extruded on the periphery end face. The end face of the rubber ring which faces the oil face side and is close to the spring has an interstice with the stop ring of the friction casing.

Description

Oil sealing (one)

Technical field

The utility model relates to a kind of seal arrangement, refers to a kind of oil sealing especially.

Background technique

Oil sealing can be installed on the heavy vehicles such as truck, big bus, and on the engineering machinery such as loader, grader and excavator, can be installed on gearbox or the motor in addition.Oil sealing comprises the wheel limit oil sealing at the wheel shaft place that is used in wheel, the main oil sealing etc. that subtracts.That oil sealing can play is dustproof, the effect of waterproof and anti-leakage of oil.Especially under the operating mode rugged environment, more need the oil sealing of good seal performance.

Fig. 1 and Fig. 2 show a kind of common wheel limit oil sealing; wherein label 5 is represented main shafts, label 6 expression bearings, the guard ring 1 of this oil sealing and the wheel hub 4 of wheel; or title pilot hole; be the rigidity contact, cause the oil sealing external diameter to leak thereby very easily produce the slit, for preventing the leakage of cooperation place; usually the method that adopts is for to spray paint at the oil sealing external diameter; guarantee mating face seal with the paint film that produces, but the paint bad, the unequal reason of film thickness all is easy to cause seal failure.

Oil sealing illustrated in figures 1 and 2 is made up of guard ring 1, the collar 2 and seal ring 3 three parts, and combination back size easily produces deviation, cannot say for sure to demonstrate,prove the dimensional accuracy of oil sealing itself.

The external diameter of Fig. 1, oil sealing shown in Figure 2--promptly: guard ring 1, adopt elbow to make three parts be linked as integral body, but become flexible distortion because of knocking of rigidity assembling easily makes elbow be impacted; even cause the oil sealing main body to come off; the assembling Rear oil seal is yielding, causes sealing effect not good, even seal failure.

The model utility content

For overcoming the above-mentioned shortcoming of prior art, the purpose of this utility model provides the oil sealing of a kind of simple in structure, good sealing effect, long service life.

For achieving the above object, the utility model provides a kind of oil sealing, and it is made up of main body and friction shell two-part, and main body is linked on the friction shell; The friction shell comprises side wall portion and circumferential part, and side wall portion is provided with peripheral end face; On circumferential part, towards pasta side one end, also be provided with catch ring; Main body comprises metal ring and rubber ring, and rubber ring has the groove of an opening towards the pasta side, and this groove comprises three anchor rings successively, and described metal ring is linked on the anchor ring; Be provided with dust excluder lips highlightedly towards atmospheric side on the rubber ring, oil sealing is before assembling, and dust excluder lips is separated with the gap with the peripheral end face of friction shell, and after the oil sealing assembling, dust excluder lips is compressed on the peripheral end face; On rubber ring, towards the end face of pasta side and adjacent springs, and be separated with the gap between the catch ring of friction shell.

Also be provided with the first secondary lip, the second secondary lip, the 3rd secondary lip and main lip on the described rubber ring highlightedly; First, second secondary lip towards atmospheric side and contact on the side wall portion of friction shell; The 3rd secondary lip and main lip contact are on the circumferential part of friction shell; Second, third secondary lip is the tight shape that contacts with the friction shell.

Rubber-coated ring on the interior fitting surface of oil sealing is coated with rubber ring on the fit on face.

Described second, third secondary lip is oblique and extends.

Described main body also comprises spring, is provided with spring groove on described anchor ring, and spring is contained in the spring groove.

Oil sealing of the present utility model is provided with multiple tracks and protects secondary lip, can prevent that muddy water and foreign matter from entering main lip, realizes the good sealing function of oil sealing; Fitting surface all is coated with rubber, has reduced the machining accuracy to pilot hole and main shaft; Owing to be provided with gap a, b, so the permission main shaft has axially, radial disbalance, alleviate of the injury of displacement kinetic energy to the oil sealing body, guarantee that oil sealing can closely keep sealing with main shaft forever; Catch ring can stop that the grease in the bearing enters oil sealing.

Description of drawings

Fig. 1 is the user mode reference view of common oil sealing;

Fig. 2 is an A portion enlarged diagram among Fig. 1;

Fig. 3 is the generalized section of the utility model oil sealing;

Fig. 4 is the perspective exploded view (part is cut off) of the utility model oil sealing;

Fig. 5 is the stereogram of the utility model oil sealing;

Fig. 6 is an oil sealing assembling of the present utility model back generalized section;

Fig. 7 is the generalized section of the utility model oil sealing main body.

Embodiment

As Fig. 4, shown in Figure 5, oil sealing of the present utility model is made up of main body 10 and friction shell 20 two-part.Main body 10 is linked on the friction shell 20.For clarity sake, the left side among Fig. 3 and Fig. 5 is called atmospheric side, the right side is called the pasta side.

As shown in Figure 4, friction shell 20 comprises side wall portion 21 and circumferential part 22, is provided with rubber ring 23 at the whole inner peripheral surface of circumferential part 22.

Shown in Fig. 3,4, described main body 10 comprises metal ring 11, spring 12 and rubber ring 15.Rubber ring 15 comprises the groove 158 of an opening towards the pasta side, and as shown in Figure 7, this groove 158 comprises three

anchor ring

158a, 158b, 158c, and described metal ring 11 is linked on anchor ring 158a, the 158b; On anchor ring 158c, be provided with ring-spring groove 16, be circular spring 12 and be contained in the spring groove 16.As shown in Figure 3, be provided with dust excluder lips 150, first secondary lip 151, second secondary lip the 152, the 3rd secondary lip 153 and the main lip 155 of ring-type on the rubber ring 15 successively.Wherein dust excluder lips 150, first secondary lip 151, the second secondary lip 152 is all highlightedly towards atmospheric side, and the equal contact of the first and second secondary lips is on the side wall portion 21 of friction shell 20; The 3rd secondary lip 153 and main lip 155 equal contacts are on the circumferential part 22 of friction shell 20.In addition, described second, third secondary lip 152,153 is oblique and extends.

Oil sealing is before assembling, and dust excluder lips 150 is state shown in Figure 3, that is: do not join with friction shell 20, and only the peripheral end face 210 with the side wall portion 21 of friction shell 20 is relative status, and is separated with a gap a.But after oil sealing was assembled, as shown in Figure 6, dust excluder lips 150 was compressed on the peripheral end face 210 of friction shell 20, can prevent effectively that the foreign matter of large-size from entering oil sealing inside, so dust excluder lips 150 is called the dustproof line in first road of oil sealing.

As shown in Figure 3, the first secondary lip 151 except that can be used for dustproof, also can be used as the buffering of oil sealing move left and right, the shell 20 of avoiding rubbing directly rubs with second, third secondary lip 152,153, has protected second, third secondary lip, and they can not damaged.The second secondary lip 152 is the tight shape that contacts with friction shell 20, prevents that thus fine dust from entering oil sealing inside, and the second secondary lip makes between friction shell 20 and the main body 10 and forms the space, can hold lubricant grease, and provide lubricated, has increased the life-span of oil sealing thus.The 3rd secondary lip 153 is the tight shape that contacts with friction shell 20, not only has dustproof effect, and the space that holds lubricant grease also is provided.Main lip 155 does not contact with main shaft 5; as shown in Figure 6; but the rubber ring 23 on the friction shell 20 is followed main shaft 5 rotations; can not make main shaft 5 cause damage thus; the influence that is not subjected to oil sealing working life of main shaft adequately protects; and metal ring 11 has not only stoped the impurity in the sealing medium to invade main lip 155, no matter guaranteed that also main body 10 is in when assembling or on-streamly come off never.

As seen, dust excluder lips 150 and first, second, third secondary lip 151,152,153 form the outpost of the tax office, four roads with friction shell 20, can stop muddy water, dust and all foreign matters to enter the main lip 155 of oil sealing, thereby realize the good sealing function of oil sealing.

In addition, as shown in Figure 3, on the circumferential part 22 of friction shell 20 of the present utility model and towards pasta side one end, also be provided with catch ring 25.On rubber ring 15, towards the end face of pasta side and adjacent springs 12, and be separated with gap b between the catch ring 25 of friction shell.Because oil sealing has following two gaps, that is: the gap a between the peripheral end face 210 of dust excluder lips 150 and friction shell 20, and catch ring 25 and rubber ring 15 between gap b, so allow main shaft 5 that axial off-centre and radial disbalance are arranged, also be, when main shaft 5 has radial disbalance to beat with axial dipole field, suitable gap can absorb the impact that brings thus effectively, alleviates the injury of displacement kinetic energy to the oil sealing body, and guarantees that oil sealing can closely keep sealability with axle forever.In addition, catch ring 25 can also stop that the grease in the bearing enters oil sealing.Need to prove that as Fig. 4, shown in Figure 5, before assembling, catch ring 25 is not holded up on the friction shell 20, otherwise can't be connected to main body 10, has only after rub shell 20 and main body 10 connect as one, and just catch ring 25 is holded up.

Main body 10 is connected as a single entity with friction shell 20, has guaranteed that the intensity of oil sealing is stood the repetition dismounting, and is repeating still to guarantee due sealability after the dismounting.

Oil sealing of the present utility model is used for all kinds of limit sealings of taking turns, the bent back sealing of gearbox one shaft sealing and engine crankshaft.Because external diameter in the fitting surface of oil sealing or the title all is coated with rubber, that is: rubber-coated ring 23 on the interior fitting surface of oil sealing is coated with rubber ring 15 on the fit on face.Thus, can not damage, reduce requirement the machining accuracy of pilot hole and main shaft to pilot hole 4 and main shaft 5, make the sealability of oil sealing and trust no longer too much working life in the assembling object surface roughness.Because utilize the elasticity of rubber, can fully guarantee under the not high situation of assembly precision, also can realize fully sealing.

Claims

1. oil sealing, it is made up of main body (10) and friction shell (20) two-part, and main body (10) is linked on the shell (20) that rubs;

Friction shell (20) comprises side wall portion (21) and circumferential part (22), and side wall portion (21) is provided with peripheral end face (210); On circumferential part (22), towards pasta side one end, also be provided with catch ring (25);

Main body (10) comprises metal ring (11) and rubber ring (15), rubber ring (15) has the groove (158) of an opening towards the pasta side, this groove comprises three anchor rings (158a, 158b, 158c) successively, and described metal ring (11) is linked on the anchor ring (158a, 158b);

Be provided with dust excluder lips (150) highlightedly towards atmospheric side on the rubber ring (15), oil sealing is before assembling, and dust excluder lips (150) is separated with the gap with the peripheral end face (210) of friction shell (20), and after the oil sealing assembling, dust excluder lips is compressed on the peripheral end face (210);

Go up at rubber ring (15), towards the end face of pasta side and adjacent springs (12), and be separated with the gap between the catch ring (25) of friction shell.

2. oil sealing as claimed in claim 1 is characterized in that, also is provided with the first secondary lip (151), the second secondary lip (152), the 3rd secondary lip (153) and main lip (155) on the described rubber ring (15) highlightedly;

First, second secondary lip towards atmospheric side and contact on the side wall portion (21) of friction shell (20); The 3rd secondary lip (153) and main lip (155) contact are on the circumferential part (22) of friction shell (20); Second, third secondary lip is the tight shape that contacts with the friction shell.

3. oil sealing as claimed in claim 1 is characterized in that, rubber-coated ring (23) on the interior fitting surface of oil sealing is coated with rubber ring (15) on the fit on face.

4. oil sealing as claimed in claim 1 is characterized in that, described second, third secondary lip (152,153) is oblique and extends.

5. oil sealing as claimed in claim 1 is characterized in that, described main body (10) also comprises spring (12), is provided with spring groove (16) on described anchor ring (158c), and spring (12) is contained in the spring groove (16).